Manuale di Istruzione
Instruction Manual
21/05/2012 58-E4800 Rev. 4 EN
3.3 Interpretation of results
The given information represents just a brief summary of testing procedure and
interpretation. For more information please refer to the specialized literature and to
national standards (e.g. UNI EN 12504-4, ASTM C597).
The ultrasonic test is a non destructive test based on the reading of ultrasonic pulse
velocity across concrete.
3.3.1 Transducers arrangement
Although the direction in which the maximum energy is propagated is at right angles to
the face of the transmitting transducer, it is possible to detect pulses which have travelled
through the concrete in some other direction. It is therefore possible to make
measurements of pulse velocity by placing the two transducers on either opposite face
(direct transmission), or on adjacent faces (semi-direct transmission), or the same face
(indirect or surface transmission). See next figure.
Fig. 3-9
NOTE:
It may be necessary to place the transducers on opposite faces but not directly opposite
each other. Such arrangement shall be regarded as a semi-direct transmission. (see
previous Figure b)
NOTE:
The indirect transmission arrangement is the least sensitive and should be used, when
only one face of the concrete is accessible, or when the quality of the surface concrete
relative to the overall quality is of interest.
NOTE:
The semi-direct transmission arrangement has a sensitivity intermediate between the
other two arrangements and should only be used when the direct arrangement cannot be
used.
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